Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Oct 13, 2026 · NIST NVD

   Detected

   Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

2. Oct 14, 2026 · NIST NVD

   Updated

   Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Affected

• cpe microsoft/365 appsversion unspecified
• cpe microsoft/office 2021version unspecified
• cpe microsoft/office 2024version unspecified
• vendor Microsoft Microsoft 365 Apps for Enterpriseversion unspecified
• vendor Microsoft Microsoft Office LTSC 2021version unspecified
• vendor Microsoft Microsoft Office LTSC 2024version unspecified

Sources

• CIRCL Vulnerability LookupVulnerability recordCVE-2026-97009

  Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

  vulnerability.circl.lu
• CVE.orgVulnerability recordCVE-2026-97009

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2026-97009

  30-day exploitation probability 0.3%

  first.org
• NIST NVDVulnerability recordCVE-2026-97009

  Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

  nvd.nist.gov

References

• Vendor Advisory · msrc.microsoft.com